20408641664326 has 4 divisors (see below), whose sum is σ = 30612962496492. Its totient is φ = 10204320832162.

The previous prime is 20408641664321. The next prime is 20408641664431. The reversal of 20408641664326 is 62346614680402.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×20408641664326² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20408641664321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5102160416080 + ... + 5102160416083.

It is an arithmetic number, because the mean of its divisors is an integer number (7653240624123).

Almost surely, 2^{20408641664326} is an apocalyptic number.

20408641664326 is a deficient number, since it is larger than the sum of its proper divisors (10204320832166).

20408641664326 is a wasteful number, since it uses less digits than its factorization.

20408641664326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10204320832165.

The product of its (nonzero) digits is 7962624, while the sum is 52.

The spelling of 20408641664326 in words is "twenty trillion, four hundred eight billion, six hundred forty-one million, six hundred sixty-four thousand, three hundred twenty-six".